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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '321db0fb84c29ce33c61de9ef4f2b744dc571678b3f1108e7b4bc241163dfdfd' 
  AND token = 'Khd+zbxAs8DZBZFFPHbZRwFn7CnycMyJt+pCJq1DPm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}